Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020	May 31, 2020
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 35.8		$ 35.8		$ 35.9
Effective tax rate	14.40%	18.90%	11.80%	16.50%